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In his early years, Linnaeus believed that the species was not only real, but unchangeable -- as he wrote, Unitas in omni specie ordinem ducit (The invariability of species is the condition for order [in nature]). But Linnaeus observed how different species of plant might hybridize, to create forms which looked like new species. He abandoned the concept that species were fixed and invariable, and suggested that some -- perhaps most -- species in a genus might have arisen after the creation of the world, through hybridization. In his attempts to grow foreign plants in Sweden, Linnaeus also theorized that plant species might be altered through the process of acclimitization. Towards the end of his life, Linnaeus investigated what he thought were cases of crosses between genera, and suggested that, perhaps, new genera might also arise through hybridization.
Was Linnaeus an evolutionist? It is true that he abandoned his earlier belief in the fixity of species, and it is true that hybridization has produced new species of plants, and in some cases of animals. Yet to Linnaeus, the process of generating new species was not open-ended and unlimited. Whatever new species might have arisen from the primae speciei, the original species in the Garden of Eden, were still part of God's plan for creation, for they had always potentially been present. Linnaeus noticed the struggle for survival -- he once called Nature a "butcher's block" and a "war of all against all". However, he considered struggle and competition necessary to maintain the balance of nature, part of the Divine Order. The concept of open-ended evolution, not necessarily governed by a Divine Plan and with no predetermined goal, never occurred to Linnaeus; the idea would have shocked him.”
(http://www.ucmp.berkeley.edu/history/lin…
Retrieved 05/22/2010)